Haz Mat Ch.2 Flashcards
What does Hazard Class 2 comprise?
Gases
Hazard Class 2 includes materials in a gaseous state at normal temperatures and pressures.
How are gases in Hazard Class 2 typically stored?
In pressure containers or cryogenic liquid storage tanks
This is necessary for safe transport and storage of gases.
What are the three divisions of Hazard Class 2?
- Division 2.1 Flammable gases
- Division 2.2 Nonflammable, non-toxic gas
- Division 2.3 Toxic gases
Each division is based on the type of potential hazard posed by the gases.
What types of potential hazards are associated with gases in Hazard Class 2?
- Energy (flammable or oxidizer)
- Toxicity (including asphyxiation)
These hazards dictate the safety measures needed during handling and transport.
True or False: Division 2.2 gases are flammable.
False
Division 2.2 includes nonflammable, non-toxic gases.
Fill in the blank: Division 2.3 of Hazard Class 2 includes _______.
[Toxic gases]
Toxic gases can pose significant health risks.
What is Hazard Class 3?
Hazard Class 3 is comprised of flammable liquids, including combustible liquids in the U.S.
What are the primary characteristics of flammable and combustible liquids?
They ignite and burn with relative ease and exhibit varying degrees of toxicity.
What incidents commonly involve Hazard Class 3?
Many hazmat incidents, such as gasoline and diesel fuel spills, involve this hazard class.
What additional hazard can some flammable liquids exhibit?
Some flammable liquids are also corrosive.
Are there divisions for Class 3?
There are no divisions for Class 3.
What can flammable and combustible liquids give off during transport?
They may give off hazardous vapors that can travel from their source.
What happens to vapors from flammable liquids if ignited?
These vapors will burn if ignited.
What are the primary hazards of flammable and combustible liquids?
The primary hazards are chemical energy, corrosivity, and toxicity.
What are some examples of thermal hazards associated with Hazard Class 3?
Fires and vapor explosions.
What is a potential asphyxiation hazard of flammable liquids?
Heavier-than-air vapors can displace oxygen in low-lying and/or confined spaces.
What chemical hazards can be produced by fires involving flammable liquids?
Toxic and/or corrosive gases and vapors.
What mechanical hazard can occur with containers exposed to heat or flame?
A BLEVE, caused by a vapor explosion.
How can vapors from flammable liquids behave?
Vapors can mix with air and maintain cohesion long enough to encounter an ignition source at some distance from the origin.
What environmental hazard can result from flammable liquids?
Pollution caused by runoff from fire control.
What are Class 4 materials?
Class 4 materials include three main categories: flammable solids, spontaneously combustible liquids and solids, and dangerous when wet substances.
What are flammable solids?
Flammable solids are materials in the solid state that can readily combust in the presence of an ignition source without changes to density or pressure.
What are spontaneously combustible materials?
Spontaneously combustible materials may be liquids or solids that can ignite within five minutes after coming in contact with air without an external ignition source.
What are dangerous when wet substances?
Dangerous when wet substances become spontaneously flammable or give off flammable or toxic gas when in contact with water.